Where to get U-bet chocolate syrup before Passover

I'll be in NY in early April, which is apparently a week or so before Passover (thanks Google). Where would be the best place to go to pick up some U-bet chocolate syrup that is specified for Passover so it uses the real cane sugar?

Are there any markets with delivery option I could just have them send a case to my hotel?

No hotel booked yet, but definitely in midtown. Don't mind traveling to get it. Maybe I can call the concierge once booked and have them procure it for me.